Abstract
Specimens of α brass wires were elongated at various temperatures of the rate of working of 1200%/sec. With the apparatus illustrated in our first report, each specimen was quenched in a very short time of 0.01∼0.04 seconds after working. The microscopic structures of the specimens thus obtained were studied with special reference to recrystallization and grain growth. The microstructure of hot-worked specimens differed from that of cold-worked ones in several points. At the working temperatures below 820°, recrystallization occurred partially and mixed with the cold-worked matrix, thus showing the nonexistence of hot-working in the real sense of the term. The rate of recrystallization during hot-working seemed to be maximum at the intermediate temperatures of hot-working. The rate of grain growth during hot-working is higher than that during simple heating at the same temperature without working.
